She was at Denise's wedding.
Camille's was either a prior commitment or came after the Villa Rosa blowup/Rinna's cupcake tweet when Lisa withdrew.
As for the bad press, my Spidey sense is telling me that a lot of it is coming from Rinna, Erika, and Kyle. Rinna and Erika were the ones responsible for the IG video spilling that Lisa was refusing to shoot with the others and Kyle is using Kris Jenner's contacts to get her version of things out.

She got a new batch of virgin blood to bathe in?
I'm getting really tired of Teddi and Dorit throwing every bit of blame they possibly can onto Lisa.
I officially do not care if she manipulated the entire situation. The others are fucking morons and liars.

Lisa's never-ending loathing of Kristen will never get old. It's a power struggle between the two of them and neither is going to bend.
I'd like to think that there was no editing trickery in regards to Peter. He was genuinely trying to mise en place in peace and was totally oblivious to Lala's meltdown.
Fucking Lala...I don't even know where to start. Dollar Tree J.Lo needs to get her shit together. Grief sucks. I get it. However, grief does not give you the right to scream at people. Raquel, James, and Billie were all more composed than I would have been. Lauren is lucky she didn't catch consequences.
She and Rand can go play with each other's assholes until he finds a younger hostess and takes Lala's Gucci slides away.
I think that's exactly right. They want James on an island. They all keep alluding to some heinous act that James committed that they can't talk about, but right now it seems like petty overreaction to a situation that Katie started.
Lala wants to be the center of James's universe. She got off on knowing that she had him in her back pocket to use when she wanted. He doesn't have her on a pedestal anymore and it burns her ass to know that. I think that's why she made the "Fucking me is the greatest thing you'll ever do!" comment. Your vag isn't special, Lala. It isn't some huge accomplishment to get a leg over on you. Anyone with the money to rent a PJ could probably do it.

Once the dog left Dorit, it would have been up to the new owner to surrender her voluntarily. If someone bought a jacket from someone and gave it to someone else, the original owner can't demand the jacket back. In the eyes of California law, the same logic applied to Lucy.
Lisa not enforcing the penalty is an entirely separate issue. Should she insist that the Kemsley's pay? Probably.

What could she have done more than she did? Other than sue for breach of contract? We don't even know if Lisa can do that as their Bravo contracts prohibit them from suing each other for any reason.
She asked Dorit for the new owner's name and contact information, Dorit wouldn't give her a straight answer. It seems that there wasn't a large time gap between Dorit telling Lisa and VPD getting the call from the shelter. Maybe a few days. Lisa made sure that Lucy was retrieved from the shelter as soon as possible. That was the only thing she could do at that time.